Superman could hear sound at almost any wavelength and at great distances.

He can hear far more sounds with far more detail at far greater distances than normally humanly possible, including sounds on frequencies undetectable by humans such as dog whistles. He is able to mentally screen out most of these sounds to be able to function normally, even in a noisy environment, and can focus in on specific things, like a person's voice or heartbeat, even if they are in another part of the city.

He can even hear sounds on other planets, which makes it likely that his hearing is fundamentally different than that of a human, as sound cannot travel through the vacuum of space.